See what happens to small breasted and slim women as they get older. Will they get bigger breasts? Will they gain weight? I have just followed 1500 TikTok accounts of women who are like that. I'll check in every 6 months or so with updates. I'm thinking that the vast majority of those women will delete their accounts after a few years or so, but that still leaves a hundred or so women who will continue uploading videos. Don't expect much for the first 2-3 years but as time goes by, this will become more useful.
If you want to know what happens, put in your calendar for exactly 6 months from now to check minichan.(Edited 6 minutes later.)